apply newterm patch with tmux support

Applied st-newterm-0.9.diff and st-newterm-0.9-tmux.diff with minor
manual adjustments:
- Added newterm() function declaration to st.h
- Added Ctrl-Shift-Return keybinding to spawn new terminal
- Integrated tmux-aware working directory detection

Benefits:
- Spawn new st instance with Ctrl-Shift-Return
- New terminal inherits current working directory
- Tmux-aware: detects CWD of current process in tmux session
- Improves workflow efficiency for multi-terminal usage

Note: tmux support is Linux-only and requires tmux to be direct child of st

1 files changed, 1 insertions, 0 deletions

diff --git a/st.h b/st.h
index e320538..9cf12fd 100644
--- a/st.h
+++ b/st.h
@@ -87,6 +87,7 @@ void draw(void);
 
 void kscrolldown(const Arg *);
 void kscrollup(const Arg *);
+void newterm(const Arg *);
 void printscreen(const Arg *);
 void printsel(const Arg *);
 void sendbreak(const Arg *);